I actually looked into this one. (see, I AM learning)...
Regardless whether you scoop micronized Creatine directly into your mouth or mix it with water (or juice or guinness or whatever) the absorbtion is still the same. Aparently the same applies to liquid creatine as well. Proponants of the liquid stuff will claim a faster absorbtion rate but according to what I have read, this simply is not true.
An Mudge hit it on the head... If you DO elect to mix your creatine with liquid, do NOT let it sit for for more than a couple minutes. In water, Creatine quickly transforms into creatinine which is worthless to you and excreted with the rest of your waste.
Cheers,
Wit